feat(i18n): add multi-language support (zh/en/de)

.env.example

@@ -1,3 +1,7 @@
+# ===== 语言配置 =====
+# 界面和提示词语言，可选: zh (中文, 默认), en (English), de (Deutsch)
+LANGUAGE=zh
+
 # LLM API配置（支持 OpenAI SDK 格式的任意 LLM API）
 # 推荐使用阿里百炼平台qwen-plus模型：https://bailian.console.aliyun.com/
 # 注意消耗较大，可先进行小于40轮的模拟尝试

backend/app/__init__.py

@@ -64,9 +64,11 @@ def log_response(response):
 
     # 注册蓝图
     from .api import graph_bp, simulation_bp, report_bp
+    from .api.config_api import config_bp
     app.register_blueprint(graph_bp, url_prefix='/api/graph')
     app.register_blueprint(simulation_bp, url_prefix='/api/simulation')
     app.register_blueprint(report_bp, url_prefix='/api/report')
+    app.register_blueprint(config_bp, url_prefix='/api/config')
 
     # 健康检查
     @app.route('/health')

backend/app/api/config_api.py

@@ -0,0 +1,12 @@
+from flask import Blueprint, jsonify
+from app.i18n import get_all_patterns, get_language
+
+config_bp = Blueprint('config', __name__)
+
+@config_bp.route('/language', methods=['GET'])
+def get_lang():
+    return jsonify({'language': get_language()})
+
+@config_bp.route('/patterns', methods=['GET'])
+def get_patterns():
+    return jsonify({'patterns': get_all_patterns()})

backend/app/api/simulation.py

@@ -15,13 +15,14 @@
 from ..services.simulation_runner import SimulationRunner, RunnerStatus
 from ..utils.logger import get_logger
 from ..models.project import ProjectManager
+from ..i18n import get_prompt, get_format, get_string
 
 logger = get_logger('mirofish.api.simulation')
 
 
 # Interview prompt 优化前缀
 # 添加此前缀可以避免Agent调用工具，直接用文本回复
-INTERVIEW_PROMPT_PREFIX = "结合你的人设、所有的过往记忆与行动，不调用任何工具直接用文本回复我："
+INTERVIEW_PROMPT_PREFIX = get_prompt('interview_api_prefix')
 
 
 def optimize_interview_prompt(prompt: str) -> str:

backend/app/config.py

@@ -19,10 +19,13 @@
 
 class Config:
     """Flask配置类"""
-    
+
     # Flask配置
     SECRET_KEY = os.environ.get('SECRET_KEY', 'mirofish-secret-key')
     DEBUG = os.environ.get('FLASK_DEBUG', 'True').lower() == 'true'
+
+    # 语言配置 (zh=中文, en=English, de=Deutsch)
+    LANGUAGE = os.environ.get('LANGUAGE', 'zh')
 
     # JSON配置 - 禁用ASCII转义，让中文直接显示（而不是 \uXXXX 格式）
     JSON_AS_ASCII = False

backend/app/i18n/__init__.py

@@ -0,0 +1,45 @@
+"""
+MiroFish i18n - Internationalisierung
+Unterstützt mehrere Sprachen über die LANGUAGE Umgebungsvariable.
+Verfügbare Sprachen: zh (Standard), en, de
+"""
+import os
+import importlib
+from typing import Dict, Any
+
+LANGUAGE = os.getenv('LANGUAGE', 'zh')
+_cache = {}
+
+def _get_module():
+    if LANGUAGE not in _cache:
+        try:
+            _cache[LANGUAGE] = importlib.import_module(f'.{LANGUAGE}', package='app.i18n')
+        except ModuleNotFoundError:
+            _cache[LANGUAGE] = importlib.import_module('.zh', package='app.i18n')
+    return _cache[LANGUAGE]
+
+def get_prompt(key: str) -> str:
+    """Get a prompt template by key."""
+    return _get_module().PROMPTS[key]
+
+def get_format(key: str) -> str:
+    """Get a format string by key."""
+    return _get_module().FORMATS[key]
+
+def get_string(key: str, **kwargs) -> str:
+    """Get a UI/status string, optionally with format args."""
+    s = _get_module().STRINGS[key]
+    return s.format(**kwargs) if kwargs else s
+
+def get_pattern(key: str) -> str:
+    """Get a regex pattern by key (for frontend)."""
+    return _get_module().PATTERNS[key]
+
+def get_all_formats() -> Dict[str, str]:
+    return dict(_get_module().FORMATS)
+
+def get_all_patterns() -> Dict[str, str]:
+    return dict(_get_module().PATTERNS)
+
+def get_language() -> str:
+    return LANGUAGE